msm: npu: send notification after power level is changed

LLM requires both pre and post notification when power level is
changed during runtime. This change is to send post notification
after power level is changed.

Change-Id: Icacd8cdb3519cdbc9ccb1222c9bd088fc480f3da
Signed-off-by: Jilai Wang <jilaiw@codeaurora.org>